/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Spring.Core;

/// <summary>
/// A <see cref="Spring.Core.ICriteria"/> implementation that represents
/// a composed collection of <see cref="Spring.Core.ICriteria"/> instances.
/// </summary>
public class ComposedCriteria : ICriteria
{
    /// <summary>
    /// Creates a new instance of the
    /// <see cref="ComposedCriteria"/> class.
    /// </summary>
    public ComposedCriteria() : this(null)
    {
    }

    /// <summary>
    /// Creates a new instance of the
    /// <see cref="ComposedCriteria"/> class.
    /// </summary>
    /// <param name="criteria">
    /// A user-defined (child) criteria that will be composed into this instance.
    /// </param>
    public ComposedCriteria(ICriteria criteria)
    {
        _criteria = new List<ICriteria>();
        Add(criteria);
    }

    /// <summary>
    /// Does the supplied <paramref name="datum"/> satisfy the criteria encapsulated by
    /// this instance?
    /// </summary>
    /// <param name="datum">The data to be checked by this criteria instance.</param>
    /// <returns>
    /// True if the supplied <paramref name="datum"/> satisfies the criteria encapsulated
    /// by this instance; false if not or the supplied <paramref name="datum"/> is null.
    /// </returns>
    public virtual bool IsSatisfied(object datum)
    {
        foreach (ICriteria criteria in _criteria)
        {
            if (!criteria.IsSatisfied(datum))
            {
                return false;
            }
        }

        return true;
    }

    /// <summary>
    /// Adds the supplied <parameref name="criteria"/> into the criteria
    /// composed within this instance.
    /// </summary>
    /// <param name="criteria">
    /// The <see cref="Spring.Core.ICriteria"/> to be added.
    /// </param>
    public void Add(ICriteria criteria)
    {
        if (criteria != null)
        {
            _criteria.Add(criteria);
        }
    }

    /// <summary>
    /// The list of <see cref="Spring.Core.ICriteria"/> composing this
    /// instance.
    /// </summary>
    protected IList<ICriteria> Criteria
    {
        get { return _criteria; }
    }

    private IList<ICriteria> _criteria;
}